secondary activity

secondary activity

美 　英

• 网络第二级活动；次级活性；第二活性

例句

The service design is usually a secondary activity, although it is sometimes done in parallel.

服务设计常常是次要的活动，尽管有时候并行地完成。

My question is: Why was official business discharged as a secondary activity formerly? And what is the primary activity?

为什么从前的机关事务是作为次要工作执行的？那首要的工作是什么呢？